磁爆加载初始阶段薄壁金属管的冲击变形研究

通过磁爆加载初始阶段脉冲磁动力对薄壁金属管加载过程的分析,将加载过程离散为强流发生、磁场形成和冲击加载三个进程,进而建立了薄壁金属管受磁载荷冲击变形的理论模型,并在此基础上,利用MAXWELL和AU-TODYN软件联合仿真的方法研究了薄壁金属管的冲击变形特征,最后对结果进行了试验验证。研究表明:理论分析、数值仿真和试验结果吻合较好,薄壁金属管在脉冲磁动力加载下的变形趋势与其外侧包裹炸药爆炸加载的情况相似,磁动力分布及其第一峰值的时间进程直接影响薄壁金属管的最终变形。

Shock-produced deformation of a thin-walled metal tube subjected to magnetic load caused by FCG in initial stage

The process of the shock-produced deformation of a thin-walled metal tube subjected to magnetic load caused by FCG(flux compression generator) in initial stage was analysed and decomposed into three phases: high current production,magnetic field formation and shock loading.On this basis,a theoretical model was established.Meanwhile,according to the theoretical model,associated simulation methods were applied to study the deformation characteristics by using the software MAXWELL and AUTODYN,and experimental verification was also carried out.The results show that all the theoretical,simulation and experimental results can coincide well,the deformation tendencies of the thin-walled metal tube caused by a pulsed magnetic dynamic load or an exploding load are both similar,and the distribution as well as the first peak time history of the pulsed magnetic dynamic load directly affect the final deformation of the metal tube.